I think as soon as we go out of the league cup where he probably will get a game in the next round he'll go on loan but the club will want someone who will actually use him no point in him just going and sitting on the bench at another club.
If he didn't get in the squad for Newcastle at home I can't see him being involved away at Chelsea. Seems to me Lingard, Tunnicliffe and Powell are all ahead of him in the pecking order.
I think the Rooney return probably didn't help him as normally he'd be watching from the stands for that game plus he had a bust up with Nani in training might have made it more difficult as we don't know and will never know the full extent of what happened there and who was to blame the fact the club didn't deny it suggests something happened.
His problem is his position is currently occupied by Kagawa/Rooney you then have players like Cleverley/Powell who may also be suited to it and the fact that he hasn't actually played a competitive game in England. Powell might be younger but he's had a season in league 2 which is much more competitive than the reserve teams games Petrucci plays.
Petrucci obviously trains with the first team on a regular basis so it might just be a case that when stepping up a level he just doesn't stand out as he has less time to pick out those killer passes to play the way he does in the premier league you have to be able to do it at break neck speed.
A loan would be great for him but it needs to be the right club who will play him and develop him like Leicester/Watford did for Cleverley as you only have to look at the loans that Macheda had to Sampdoria/QPR to see how they can work against a player.
I like Petrucci but I fear his time might have passed at United. He had a couple of long term injuries early in his time here which really halted his progress. I would have liked to have seen him given some sort of chance and maybe his loan period will give him that.
Very talented, would perhaps have been better but for the 2 injuries that kept him out for 18 months. If a bid came in next summer, I can see us accepting. It's incredibly hard to breakthrough, I would like to see Fergie have a bit more trust in the more talented young players when it comes to the League Cup but he knows what he's doing, i'm sure he has his reasons.